Hey, thanks for making this potentially useful app
i tried it on my motorola bionic with both koush's bootstrap clockwork recovery (version 126.96.36.199) and hashcodes' twrp-based safestrap recovery, same result for both attempts; doesn't recognize the backups.
paths for recoveries are...
btw, these two recoveries are the only ones available for virtually all moto devices (besides developer editions).
hope this helps, let me know if you need any more info.